| SUN Jian-zhong,ZHANG Wei-min,WANG Zhi-kang,CAI Jin-song.Radiation exposure to patients during examinations of direct radiography system[J].Chinese Journal of Radiological Medicine and Protection,2009,29(6):646-650 |
| Radiation exposure to patients during examinations of direct radiography system |
| Received:May 18, 2009 |
| DOI：10.3760/cma.j.issn.0254-5098.2009.06.032 |
| KeyWords:Direct radiography DICOM Entrance surface dose Diagnostic reference level |
| FundProject: |
| Author Name | Affiliation | | SUN Jian-zhong | Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China | | ZHANG Wei-min | Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China | | WANG Zhi-kang | Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China | | CAI Jin-song | Department of Radiology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China |
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| Abstract:: |
| Objective To evaluate and analyze the statistical distribution of patient dose during different examinations by using the data stored in a DICOM image archive of a direct digital radiography system. Methods An automatic procedure to extract dose data and exposure parameters from the image archives was implemented. 5160 images were collected from a Zhejiang province hospital including chest PA and LAT, thoracic spine AP and LAT,lumbar AP and LAT,abdomen and pelvis. Exposure parameters and the dose area product (DAP) stored in the image DICOM head were examined for each image. The entrance surface dose (ESD) was estimated considering the DAP and the geometric parameters during each examination. Results Thoracic spine AP and LAT,lumbar LAT and abdomen AP DAP had a variable coefficient below 60%, while the others ranged from 60% to 80%.Compared with DAP at different locations, the ratios between the maximum and the minimum value of DAP were high except for abdomen AP that the maximum value was 3 times than the minimum value. The ratios between the maximum and minmun value for PAP lumbar AP, lumbar LAT, thoracic spine LAT, chest PA and LAT,pelvis PA and thoracic spine PA were 46, 30, 23, 23, 18, 16 and 11, respectively. The ESD values obtained were substantially lower than DRL. DRL were over three times more than the 3rd quartile value of ESD distribution for the chest PA and LAT,lumbar AP and LAT. DRL were over five times more than the 3rd quartile value of ESD distribution for the abdomen and pelvis AP, thoracic spine AP and LAT projections. Conclusions There are great variation between DAP and ESD distributions.The radiographic device allows substantial dose savings compared with estimations made for nondigital or for phosphor-plate based systems. Frequent patient dose audits should occur when digital techniques are introduced. The quality management in image quality and patient dose in digital radiology should be necessary. |
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